Expansion-bolt.



G. 0. SMITH.

EXPANSION BOLT.

APPLICATION FILED APR.11, 1910.

977,232. Patented Nov. 29, i910.

; 4 Attorney;

GROVER C. SMITH, OF LA GROSSE, KANSAS.

EXPANSION-BOLT.

Specification of Letters Patent.

Patented Nov. 29, 1910.

Application filed April 11, 1910. Serial No. 554,818.

To all whom at may concern:

Be it known that I, GRovnR C. SMITH, a citizen of the United States,residing at La Crosse, in the county of Rush and State of Kansas, haveinvented a new and useful Ex pansion-Bolt, of which the following is aspecification.

It is the aim of the present invention to provide an improvedconstruction of expansion bolt and the bolt of the present invention isdesigned primarily for use in securing metallic elements such as theattaching portions of foot scrapers and the like, upon stone or otherbases of masonry. More specifically, the invention aims to provide abolt of this type and for this purpose which will not be liable tobecome rusted nor to be otherwise affected by the elements.

It is a further aim of the invention, inasmuch as such devices aresubjected tocorrosion by the elements and by accumulations of mud, to soconstruct the nut for the bolt that it will house all portions of thebolt above the plane of the said attaching portions of the scraper.

With the above and other objects in View, the invention consists in thegeneral arrangement and construction of parts shown in the accompanyingdrawings, in which,-

Figure 1 is a front elevation of a foot scraper secured in place by theexpansion bolts embodying the present invention, one of the said boltsbeing shown in elevation and one being shown in 'vertical section. Fig.2 is a plan view of one of the attaching portions ofthe scraper, theupper end of one of the expansive-shell sections being illustrated infull lines in the position it assumes with relation to the saidattaching portion when the nut of the bolt is tightened and in .dottedlines, the position it is caused to assume when about to be disengagedfrom the said portion. Fig. 3 is a perspective view of one of theexpansive-shell sections.

In the drawings, there is shown an ordinary form of foot scraper,indicated in general .by the reference character A and this scraperincludes the usual standards or side members which at their lower endsare bent to afford attaching portions or cars 5. For a purpose whichwill be presently explaine each of the ears 5 is formed withan openingwhich is not, however, circular as is usually the case in such devices,but, while circular in general outline, as indicated bythe numeral 6, isformed with diametrically oppositely located lateral rectangular slotextensions 7 The means for securing the foot scraper in place upon itsbase is, as heretofore stated, in the form of an expansion boltincludingan expansive sleeve, an expanding bolt, and a nut. Of theseseveral elements, the expansive sleeve consists of two sectionsincluding each a body 8, a shank 9 and a head 10 and the body of eachsaidsection, except for certain slight variations in contour to bepresently described, is generally semi-cylindrical and the plane side ofthis body is hollowed out or formed with a groove 11 which, asillustrated in the drawings, is increased in depth from its upper to itslower end in a gradual manner, the true bottom of the groove extendingin-a curved line. Th said section is of the same width throughout itsbody from edge to edge ofthe plane fa'co thereof, but in a plane atright angles to the plane of this face the body is tapered toward itslower end and its convex face is formed, at its lower end, with anoutstanding beveled shoulder 12 having a sharp biting edge 13. The shank9 of the section is of dimensions less than the cross-scctionaldimensions of the body and is substantially rectangular, as illustratedin Fig. 3 of the drawings, although that face which corresponds to andis presented in the same direction as the plane face of the body, isgrooved in a manner similar to the said body. The head 10 which islocated at the upper end of this shank is of about the same dimensionsin top plan and also of about the same contour, when so viewed, as isthe upper end of the body 8, there being a shoulder 14 formed at thejuncture of the lower end of the shank with the body and a shoulder 15formed atthe uncture of the upper end of the shank with the said head10.

The expanding bolt includes a'threaded shank 16 and a head 17 which isrectangular in cross section and is gradually expanded or enlarged fromits point of juncture with the lower end of the shank, to its lower end.The nut which is to be threaded upon this bolt and tightened to draw thesame upwardly between the sections of the expansive sleeve for thepurpose of relatively separating or expanding thesev sections has asleeve portion 18 and a hollow cylindricalbody 19 at the lower end ofits heads 10 of the expansive sleeve sections when the said sections areassembled about the bolt.

It will be observed that the openings 6 at their intermediate or midportions are of such dimensions as to permit of the insertiontherethrough-of the heads 10 of the sections of the expansive sleeves,the said sec-- tions being inserted into place one ata time. Subsequentto the disposal of the shanks of the expansive sleeve sections in therectangular slot extensions of the openings 6, the threaded shank 16 ofthe expanding bolt is inserted between the said expansive sleevesections and the nut 18 is partly threaded upon the bolt, the footscraper A being then disposed upon the base B with the bodies of theexpansive sleeve sections and the lower or head end of the expandingbolt depending into the usual bore or socket 20 formed in the said base.The nut 18 is then tightened so as to cause the attaching portion 5 ofthe foot scraper to bear firmly against the upper face of the said base.It will be observed that the distance between the shoulders 14 and 15 isgreater than the thickness of the attaching portion of the foot scraperand that before the nut 18 is tightened upon the bolt, the expansivesleeve sections will drop by gravity with their shoulders 15 restingagainst the edges of the extensions of the opening in the said attachingportion and that their shoulders 14 will not come into engagement withthe under side of the said portion so that when the nut 18 is tightened,the full tension force created by such manipulation of the nut will beto draw upwardly upon the bolt 16 and fully expand the said sleevesections. In this respect, the sleeve sections of the de vice differfrom the corresponding members of similar devices and there is nolikelihood of the tension or wedging action of the bolt being lost orimpaired.

lVhat is claimed is.

1. In a device of the class described, an

expanding bolt, expansive sleeve sections fitted upon the bolt, eachsection comprising a body, a shank, and a head; and a nut threaded uponthe bolt and having a hollow body portion receiving and housing the saidheads of the expansive sleeve sections.-

2. In a. device of the class described, an expanding bolt, expansivesleeve sections fit ted. upon the bolt, each section comprising ashouldered body, a shank, and a head at the upper end of the shank; anda nut threaded upon the shank of the bolt and housing the upper portionof the said shank, the nut having a hollow cylindrical body portionhousing the heads of the expansive sleeve sections.

3. In a device of the class described, an expanding bolt, expansivesleeve sections fit.- ted upon the bolt, each section comprising a body;a shank; and a head, the said shank, being located between the body andhead and affording shoulders at the points of its juncture with the bodyand the head, the distance between the shoulders being greater than thethickness of element to be secured, gnld a nut threaded upon the shankof the 4:. In a device of the class described, an expanding bolt,expansive sleeve sections fitted upon the bolt, each section comprisinga body, a shank, and a head, the said shank being located between thebody and head and affording shoulders at the points of its juncture withthe body and the head, the distance between the shoulders being greaterthan the thickness of an element to besecured, and a nut threaded uponthe shank of the bolt, the shoulder at the juncture'of the shank and thehead being designed to rest upon the edges of the opening in an elementto be secured, through which opening the shanks of the sections engage.

In testimony that I claim the foregoing as my own, I have hereto aflixedmy signature in the presence of two Witnesses.

GROVER C. SMITH. lVitnesses HARRY T. FISH, A. P. SMITH.

